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I have noticed that my Wifes Forester XT "shakes" for a few seconds immeaditely after start up. Its more of a shake then a vibration. Could be what he was talking about. Once underway way though, it idles fine, and acceleration is very smooth.
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[quote name='Gumby'][quote name='gurpman']USA Today "But the turbo four vibrates remarkably at idle"[/quote] It's a boxer Dude, get with the program, think for a second it which direction the pistons are moving :roll:[/quote] OK, edjumicate me... why would horizontally moving pistons create more vibration, wouldn't it just affect the direction of vibration? And why was this noted as a problem in the 2.5T and not the H-6? Is stuttering and jerking during moderate acceleration a characteristic of a boxer as well? :oops: Hmmm, who's the Gumby now? Ha ha, just kidding dude!
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The motion of 6 cylinders is noted to make it slightly smoother, but I can't imagine it will be by a huge margin. They all shake a bit (boxers anyhow) on startup. If that's the worst thing in the world, WOW! It's not your Lexus ES300 where you expect that ultra-smoothness.
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[quote name='gurpman'][quote name='Gumby'][quote name='gurpman']USA Today "But the turbo four vibrates remarkably at idle"[/quote] It's a boxer Dude, get with the program, think for a second it which direction the pistons are moving :roll:[/quote] OK, edjumicate me... why would horizontally moving pistons create more vibration, wouldn't it just affect the direction of vibration? And why was this noted as a problem in the 2.5T and not the H-6? Is stuttering and jerking during moderate acceleration a characteristic of a boxer as well? :oops: Hmmm, who's the Gumby now? Ha ha, just kidding dude![/quote] 1. At idle the motor is turning at 750 rpm on a HORIZONTAL plain as apposed to a vertical plane, it is therefore rocking a bit on it's motor mounts in a side to side motion whereas with a inline, or V configuartion the pistons are moving in a up down motion. This is most noticable when you kill the motor, you can can sense the pistons slowing down and stopping, often the car will shake just a little when they stop moving. 2. Turbo boxers do a little "stuttering and jerking" from time to time, mine does anyway.
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Having summer tires as an option would be nice. The TL 6MT can come with summer tires that are RE030 which stick quite well. Heck, some PZero Nero tires would be great as OEM, but it won't ever happen.
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Here's some quick reading on engine balance and smoothness. All boxer engines have perfect first-order balance. [url]http://www.ukcar.com/features/tech/Engine/smoothness/smooth%204.htm[/url] [url]http://www.wordiq.com/definition/Flat_engine[/url] [url]http://autozine.kyul.net/technical_school/engine/smooth5.htm[/url] [url]http://www.autoworld.com/news/Subaru/Boxer_engine.htm[/url] Ken
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[quote name='racerdave']Yeah, I have the 950s on my wife's car and they are definitely better than the 92s. Sigh.[/quote] I am seriously interested in getting good quality tires on the vehicle immediately after I get it but I am not knowledgeable about tires. Can someone shed some light on [b]why[/b] THE 950s are better than the 92s? What should I look for (spec wise) in a tire?
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Better than my words, go to TireRack.com and do a comparison between the two in test marks and see what reviewers have to say. The RE950 definitely gets better marks all around for similar cost IIRC. It's just another Bridgestone tire if they have some sort of contract with them and it's a decent all-season if there is such a thing, at least in snow comparison to the RE92 while also having better dry/handling ability. I think in next to all marks, the RE92 is the bottom of the barrel, probably why several like Kevin refuse to even have them on his car at all.
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[quote name='Ken S']Here's some quick reading on engine balance and smoothness. All boxer engines have perfect first-order balance. [url]http://www.ukcar.com/features/tech/Engine/smoothness/smooth%204.htm[/url] [url]http://www.wordiq.com/definition/Flat_engine[/url] [url]http://autozine.kyul.net/technical_school/engine/smooth5.htm[/url] [url]http://www.autoworld.com/news/Subaru/Boxer_engine.htm[/url] Ken[/quote] Interesting stuff, thanks for taking the time to look it up and post it. Now if I could just get someone to explain how Volvo's inline 5 works... :roll:
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[quote name='SUBE555']Better than my words, go to TireRack.com and do a comparison between the two in test marks and see what reviewers have to say. [/quote] Wow. :o There is not a another tire with as good a treadwear rating and warranty for the performance and price on the whole site. Good recommendation. Thanks!
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[quote name='jk']consider the firestone firehawk sz 50's. good wear and top ratings wet and dry. then just switch to snows (i like the dunlop winter sports)[/quote] Another very good recommendation. Availability and pricing will definitely play a part in deciding when the car comes in.
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With the imports and Subarus in particular, you won't find too many running Firehawks. Generally found more on domestics. If we want to talk tires, we should take it to the tech section, but many run BFG, Bridgestones, Falken, Kumho, Michelin, Pirelli, Sumitomo, Toyo, Yokohama, and a few others. Dunlop Winter sports are fairly good though. :)
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i once hydroplaned while driving a ford explorer on an interstate, running between an 18 wheeler and a concrete barrier. after that experience, performance in the rain became a very high priority, and my wrx has firehawks.
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[quote name='coolbluelb']Interesting stuff, thanks for taking the time to look it up and post it. Now if I could just get someone to explain how Volvo's inline 5 works... :roll:[/quote] Do you know how an inline 4 works? Add a cylinder.
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I guess it just seemed easier with four cylinders. I mean, four cylinders, four-cycle engine. The math works out easily. With five cylinders, it just seems like the fifth cylinder will be firing at the same time as the first. I am sure this is not right, but I am not seeing the big picture... :( ***edit*** Now that I have been ridiculed about this topic, I have decided to figure it out... I guess if one built the crank shaft in a penta design, then cylinder one would not return to the beginning of it's stroke after cylinder four had fired. Instead, it would still be on the upstroke, and would not begin a new stroke until after cylinder five had fired. Is this closer to the truth?
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Hmm... not totally sure. But Audi had them in the 90s, Volvo has them not, GM has them now in some of their trucks, and Honda is using them in MotoGP. Well, actually the Honda is a V-5, so it's a little different. But there's probably some good 5-cyl tech out on the web somewhere... I've just never had the urge to check it out.
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[quote name='coolbluelb']I guess it just seemed easier with four cylinders. I mean, four cylinders, four-cycle engine. The math works out easily. With five cylinders, it just seems like the fifth cylinder will be firing at the same time as the first. I am sure this is not right, but I am not seeing the big picture... :( ***edit*** Now that I have been ridiculed about this topic, I have decided to figure it out... I guess if one built the crank shaft in a penta design, then cylinder one would not return to the beginning of it's stroke after cylinder four had fired. Instead, it would still be on the upstroke, and would not begin a new stroke until after cylinder five had fired. Is this closer to the truth?[/quote] Here is a good article covering the different engine layouts - [url]http://autozine.kyul.net/technical_school/engine/smooth2.htm[/url] for teh noob(s).
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